package com.rc.saas.tenant.common.utils;


import org.apache.shiro.crypto.hash.SimpleHash;
import org.apache.shiro.util.ByteSource;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * MD5加密工具
 */
public class MD5Utils {
    //静态盐值
    private static final String SALT = "1jin-zhuang2";

    private static final String ALGORITH_NAME = "md5";

    // 全局数组
    private final static String[] strDigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    //加密迭代次数
    private static final int HASH_ITERATIONS = 2;

    public static String encrypt(String pswd) {
        String newPassword = new SimpleHash(ALGORITH_NAME, pswd, ByteSource.Util.bytes(SALT), HASH_ITERATIONS).toHex();
        return newPassword;
    }

    public static String encrypt(String username, String pswd) {
        //统一变为小写
        username = username.toLowerCase();

        String newPassword = new SimpleHash(ALGORITH_NAME, pswd, ByteSource.Util.bytes(username + SALT),
                HASH_ITERATIONS).toHex();
        return newPassword;
    }

    public static String getMD5Code(String strObj) {
        String resultString = null;
        try {
            resultString = String.valueOf(strObj);
            MessageDigest md = MessageDigest.getInstance("MD5");
            // md.digest() 该函数返回值为存放哈希值结果的byte数组
            resultString = byteToString(md.digest(strObj.getBytes()));
        } catch (NoSuchAlgorithmException ex) {
            ex.printStackTrace();
        }
        return resultString;
    }

    // 转换字节数组为16进制字串
    private static String byteToString(byte[] bByte) {
        StringBuffer sBuffer = new StringBuffer();
        for (int i = 0; i < bByte.length; i++) {
            sBuffer.append(byteToArrayString(bByte[i]));
        }
        return sBuffer.toString();
    }

    // 返回形式为数字跟字符串
    private static String byteToArrayString(byte bByte) {
        int iRet = bByte;
        // System.out.println("iRet="+iRet);
        if (iRet < 0) {
            iRet += 256;
        }
        int iD1 = iRet / 16;
        int iD2 = iRet % 16;
        return strDigits[iD1] + strDigits[iD2];
    }

    public static void main(String[] args) {
        //System.out.println(MD5Utils.encrypt("admin", "123456"));
        //System.out.println(MD5Utils.encrypt("tenant", "123456"));
        System.out.println(MD5Utils.encrypt("gxky", "123456"));
        System.out.println(MD5Utils.encrypt("gxkyfx1", "123456"));
        System.out.println(MD5Utils.encrypt("18719057674", "123456"));
    }

}
